#!/usr/bin/env node 
const log=console.log,
      usr={
        name:'guoyuxin',
        age:'19',
        qq:'1963916399'
      };
//\t 对齐  \n换行
log('name:\t%s',usr.name);
log('age:\t%d',usr.age);
log('usr:\t%j',usr);
log('age:\t'+usr.name);
log('name:\t',usr.name);
console.error('error message');
console.table(usr);
